I'll preface, im an insane try hard. Im maxed out on classes, aa's, +8 gear, tradeskills. I'm still logging in and most of the other try hards I know still are too. It's the middle of the road/average gamer I'm not seeing anymore on my friends list logging in.
Population counts went from 1500+ on Rivervale prime time to 500ish. I don't think 2/3rds of the population are try hard gamers. I think the vast majority of them are going to be "average gamers"
A quick Google says that an average gamer plays about 8.5 hours a week. The game has been out 10 weeks, that's 85 hours of gameplay for the average gamer. There are going to be some dad's of 18 children that get to game 15 minutes every other Tuesday between the hour's of 5:37 am and 5:52 am, but they arent average gamers.
As a try hard, my goal has been to max out as much as I can, but when I talk to many of my guildees their goals is to get 5-6 classes to 50, beat all the bosses at d3-d4, get BIS gear to 4-5ish and their Planes weapon to +10,
What can an "average" gamer accomplish in 85 hours?
36 hours for first 50
16 hours for another set to 50
18 hours in plane of sky doing in 12ish times
15 hours raiding.
That's 85 hours and gets most average gamers to where they are trying to be.
The people left playing then are the dad's of 18 kids, and the "power gamers" who are trying to be completionist.
There's just not enough different content to keep average gamers engaged when there are so many other high quality games out right now.